Seiko Cal. 6638 - 712

The Seiko 6638-712 represents an important milestone in Seiko's 1991 lineup. The Fixed bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-6b41f0f75874]

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

46mm

Case Thickness

12.9mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

160m

Dial Color

White

Jewels

17j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1991

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